FLORIDA, July 20 ― A Florida jury found Tesla Inc 1 per cent negligent in the death of an 18-year-old man whose Model S sedan slammed into a concrete wall, with the teenager and his father 99 per cent at fault.

Monday's verdict by a Fort Lauderdale federal jury came in what lawyers for the teenager's parents James and Jenny Riley called the first trial against Elon Musk's company over an accident involving its vehicles.

Jurors found Tesla negligent for deactivating a “speed limiter” that the parents had installed to keep their son Barrett from driving too fast.

Barrett Riley was driving at 116 miles per hour (187 kph), on a curve with a posted 25 mph speed limit, on May 8, 2018, when he lost control of his 2014 Model S while trying to pass another vehicle, causing a fire.

Another passenger also died while a third occupant survived.

The jury found Tesla 1 per cent negligent, Barrett Riley 90 per cent negligent, James Riley 9 per cent negligent and Jenny Riley not negligent in Barrett Riley's death.

It said James and Jenny Riley suffered a respective US$4.5 million (RM20 million) and US$6 million of damages for pain and suffering, which the judge can reduce based on the negligence findings.

Tesla's lawyers did not immediately respond yesterday to requests for comment.

Riley's parents said the crash occurred after Tesla, without their knowledge, disabled a device capping the Model S's speed at 85 mph (137 kph).

They also said a design defect in Tesla's lithium-ion battery cells and battery pack contributed to the fire.

Tesla said Barrett Riley's recklessness caused the crash, and his parents should have taken away the keys after his March 2018 speeding ticket for driving at 112 mph (180 kph).

It also said Barrett Riley tricked its technician into disabling the speed limiter, that the battery design was not defective.

In a statement, the Rileys' lawyer Curtis Miner said they were pleased with the negligence finding, and hoped the case would help prevent other accidents and save lives.

Tesla has faced a variety of lawsuits and regulatory probes over crashes tied to its Autopilot feature. That feature was not at issue in Barrett Riley's crash, court records show. ― Reuters